Check-valve for pneumatic tires.



G. A. HAAS.

CHECK VALVE FDR PNEUMATIC TIRES APPLICATION FILED AUG.26, 1910.

Patented Jan. 21, 1913.

IN VENTOR..

l Illlll Ill ATTORNEY.

m In. Inn-Inn:

UNITED sra rns rarsnr cum-cu.

cYRus A. HAAS, or s'r. Louis, iarssounr;

CHECK-VALVE FOR To all whom it may concern:

Be it known that I, CYRUS A. HAAS, a, citizen ot the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Check- Valves for Pneumatic Tires, of which the following is a full, clear, and exact description, reference being had to the accom-. panying drawings, forming a part hereof.

My invention has relation to improvements in check-valves for pneumatic tires; and it consists in the novel construction of valve more fully set forth in the specification and pointed out in the claims.

In the drawings, Figure 1 is a cross-sectiOn of a pneumatic tire (broken away) and supporting rim, showing my check-valve applied thereto; Fig. 2 is an enlarged middle longitudi-mrl section of the valve; Fig. 3 is a'cross scction on the line 3-3 of Fig. 2; Fig. 4 is an enlarged sectional detail of the valve-casing and valve-stem engaging the gasket which arrests the valve, the casing not being fully driven home; Fig. 5 is a similar view with casing driven its full limit, and showing theedge of the gasket squeezed behind the threads of the valvestem; Fig. 6 isa detached perspective of the gasket; and Fig. 7 is a crosssection on the line 7 7 of Fig. 4.

The object of my invention is to provide the prevailing form of automobile or other pneumatic tire with a check-valve attachment which will make easy the work of inflation, consuming a minimum amount of energy on the part of the operator by whom, or the motor by which the pump infiating the tire may be actuated.

A. further object is to construct a valve which will be simple, readily attachable to prevailing tires, one which'shall be cheap, durable, light, air-tight, requiring no leading; one provided with a special metallic gasket which is forced to its seat within the valve-casing by the outer end of the valve-stem leading from the inflatable section of the tire; one provided with a large air passage for the free influx of air into the tire; one made of a minimum number of parts; one in which the gasket remains permanently on its seat, special provision being made at the outer ends of the screwthreaded portion of the valve-stem to force the gasket edges around the threads of such stem; oneinsuring a permanent join-t whenever the valve-casing is screwed to the valve- Specification of Letters Patent. Application filed August 25, 1910. s iaij m.. 57,i1a;-

PNEUMATIC amiss.

Patented Jam-21,1913.

stem; and one possessing'further andother advantages better apparent from a detailed ilescript'ion of the invention, which is as folows:

Referring to the drawings, T represents the inner inflatable tube, and T the outer section as well understood in the art. In the present illustration is shown a wooden telly R to which the rubber section T is seinner end in a flaring head or mouthQwhich is in communication with the inflatable tire section T, the stem bein exteriorly screwthe head 2 is drawn firmly against the edges of the outer envelop or section T. The

vailing constructions carries a check-valve threaded and carrying a ock-nut 3 by which outer reduced ste n or nipple 1 in the pre-' which in the present case is omitted and in lieu thereof there is substituted the checkvalve attachment forming the subject mat-- ter of the present invention.

The invention consists of a valve-casing;

l screw-threaded on the interior so as to screw over the nipple 1 as shown (Fig. 1) that threads in the casing terminating at the annular shoulder or seat 3 formed at the base of the threads. The casing 4 is provided with a circular metallic disk or gasket 5 (preferably of copper) from which is stamped or slit :1 central'bridge-piece or abutment a which is not only bowed outwardly or toward the hall-valve confined in the casing, but is at the same time transversely arched thus presenting a section of substantially a spherical surface to the valve I when the latter is arrested by said bridgepiece during the act of inflation. Opposite the member a, the body of the diskii) is bowed inwardly which thus imparts a dishshaped configuration to the central portion of the disk, the outer portions of which rest on the annular shoulder s referred to." A seat dis formed for the valve 6 at the base of the reduced exteriorly screw-threaded stem or neck 4' forming the outer terminal of the valve-casing 4over which neck the end of the hose (not shown) leading from anyavailable air-pump is passed duringthe inflating operation as well understood in the art. When the inflation is complete, the

compressed air within the tire drives the check-valve-6 against the conical seat (Z, and

the neck 4 is closed by a valve-cap 7 prefsex-ably provided with a compressible packing disk 8 atthe bottom thereof for engaging they end of the neck '(Fig. 2). During thelinflatingoperation the inflowing air nnsjeats the valve 6 forcing it against the bridge-piece or abutment a (which it engages centrally at practically a single point It will be observed-from Figs. l and 5,-

that the bore of the casing l just above the shoulder s is somewhat tapered so that when the cylindrical nipple 1- of the valve stem 1 is driven home, the taper of the bore referred to will compress the'walls of the nippleand effect a very tight joint, thus dispensing with leading or any packing whatsoever. The nipple in being driven home squeezes the outer edges of the gasket 5 well into the spaces between the threads in the casing 4 making a double joint, that is to 5 say, ajointv with the threaded portions of both the parts lv and the screw-threads of the casing .4. Before the gasket 5 is thus squeezed it occupies the position. represented inFig. 4, but after the parts are driven 40 home, the result is more on the order represented invFig. 5. The bowing of the abutment a toward the valve 6 and the dishing of the main body of the gasket in the opposite direction results in the formation of a maximum opening 0 for the influx of the air; and the transverse arching of the'abutment or bridge-piece a (Fig. 7) imparts to "the-latter a substantially spherical curvature the center of which is engaged by the valve 6 when the latter is unseated (Fig. 2 dotted position). The valve thus contacts withithe abutment a at the center, allowing the inflowing air to pass freely around the valve through the opening 0 and into the the T. In practice the area of the opening 0 should correspond to the crosssectional areas of the passageways of the valve-stem 1, 1, and of the neck at of the casing 4 respectively, and the arearof the annular 6o clearance between the valve 6 and the inner 'wall of that portion of the casing l within which the valve is confined (between the seat (Z and the shoulder s) should likewise conform to the areas'ofthe respective cross- 5 sections, of the neck-tQ's'tem 1, 1, and of the opening 0. In other wordsthe cross-sectional areas of the. passage-ways of, the several elements which the air must traverse should correspond to one another, sothat no obstruction be offered to the inflating current.

moved, the hose conducting the compressed air is attached to the stem 4, the current on seating the valve. 6 driving I it against. the

abutment a, the inflating current flowing without obstruction into the tire T. When the operation is complete the compressed air .To inflate'the tire, the valve-cap 7 is redrives the valve 6 against its seat d; after this the cap 7 is restored to its position on the stem 4' sealing the air. The tight joint.

shouldered to the casing a suitable distance from the seated position of the valve, and a central abutment formed with the gasket and spanning the opening thereof for .arresting the ball during inflation of the tire,

the center of the abutment being opposite the center of the opening.

2. In combination with a valve-stem, a check-valve comprising a casing coupled'to said stem and provided with avalve-seat, a spherical valve or ball normally forced to said seat under fluid pressure from the valve-,. stem,a centrally perforated gasket shouldered to the casing at a point removed from the seated position of the valve and forced to said shoulder and against the walls of the valve-stem, a centrally perforated gasket,

casing by the engaging end of the valve stem thereby making a tight joint, and a central abutment forming a part of the gasket and spanning the opening thereof for arresting the valve during inflation of the tire.

-3. In combination with a valve-stem, a,

check-valve comprising a valve-casing coupied to said stem, and provided with avalveseat, a ball valve normally forced to said seat under fluid-pressure from the valvestem, a perforated circular gasket shouldered to the casing at a pointremoved from the seated position of the valve and in engagement with the outer end of the valvestem, a' central section of the gasket being bowed toward the valve and forming an abutment for the latter during the unseating thereof, the portions on each side of theabutment being dished away from the valve, whereby an opening i left in the gasket for the passage of air therethrough in either direction.

' 4. In combination with a valve-stem, a-

chcck-valve comprising a valve-casing coupied to said stem and terminating in an outer stem provided with an inner valveseat, a ball-valve normally forced to said seat under fluid pressure, a gasket having an opening and provided with a central valve-' abutment bridging said opening, the outer edges of the gasket engaging the outer end of the valve-stem, the cross-sectional areas of'the respective passage-ways of the valvestern and easing stem, corresponding substantially to the areaof the' annular passage-way around the valve, or to the area of the opening in the gasket, whereby the air is free to. flow without obstruction,'during inflation of the tire.

5. In combination with a valve-stem, a casing screwed over the same and provided with a valve-seat, a ball-valve normally engaging said seat, and an opendished gasket interposed between the valve and valvestem and provided with a central bridgepiece, bowed toward the valve and forming an abutment therefor with the unseating of the valve.

6. In a check-valve, a gasket comprising a disk having a central ortion bowed in one direction from the ad acent face of the disk, and dished in the opposite direction on. either side of the bowed portion, an opening being thereby left in the disk for the free travel of fluid. I 7. In a check-valve, a gasket comprising a disk having a permanently open central opening, the portions of the disk adjacent the opening being dished in one direction,

and a bridge-piece spanning the opening between the dished portions.

'In testimony whereof I aflix my signature, in presence of two witnesses. CYRUS A. HAAS.

Witnesses:

EMIL STAREK, CHASfJ. GARCIA. 

